Carr, Alan. (2003). Positive Rsychology. Handbook of psychology New York: BrunnerRoutledge Press.
Coombe, Duncan D. (2010): Secure Base Leadership: A positive theory of Leadership incorporating safety, exploration and positive action, Case Western Reserve University Phd Dissertation
Gable, S.L. Haidt, j. (2005). What is positive psychology. Review of General psychology.
Hsieh, H. F, & Shannon, S. E. (2005). Three approaches to qualitative content analysis. Qualitative health research, 15 (9), 1277-1288.
Luthans, F.; Vogelgesang, G. R. and Lester, P. B. (2006). "Developing the Psychological Capital of Resiliency". Human Resource Development Review. 5(1): 25-44.
Mayring, P (2000). Qualitative content analysis. Forum Qualitative Sozialforschung / Forum: Qualitative Social Research, 1 (2), Art. 20
Seligman, M. E. P.; Rashid, T. and Parks, A. C. (2006). "Positive psychotherapy". American Psychologist. 61: 774-788
Sheldon, K.M. King, L. (2001). Why positive psychology is necessary. American psychologist.
Snyder. C. R. (2000).Handbook of Hope: Theory, Measures and Applications. Edited by C. R. Snyder. U. S. A.: Acaemic Press.
Tugade, M. M. and Fredrickson, B. L. (2004). "Resilient individuals use positive emotions to bounce back from negative emotional experiences". Journal of Personality and Social Psychology. 86: 320-333